7B81P
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The Tektronix 7B81P is a programmable time base plug-in for 7000-series scopes that was probably designed in 1975.
It is composed of a digital board, a trigger board, and a sweep board. On the digital board, there is a Motorola 6800 microprocessor and six 6820 Peripheral Interface Adapter ICs to provide more I/O pins. On the trigger board, there is a 155-0126-00, a 155-0109-00, two AD7511 analog switch ICs, an MC1408 DAC, a CD4053 analog switch, and a couple of opamps.
The sweep board is mostly discrete and makes use of Tek-made timebase capacitors.
Key Specifications
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Pictures
Parts
Some Parts Used in the 7B81P
| Part | Part Number(s) | Class | Description | Used in |
|---|---|---|---|---|
| 155-0109-00 | 155-0109-00 • 155-0109-01 | Monolithic integrated circuit | trigger | 5B25N • 5B31 • 5B40 • 5B42 • 5B44 • 5S14N • 7B50A • 7B53A • 7B80 • 7B85 • 7B87 • 7B81P • 7B90P • 7S14 • 7612D • SC502 • SC503 • SC504 |
| 155-0126-00 | 155-0126-00 | Monolithic integrated circuit | trigger source selector and P-P auto amplifier | 7B50A • 7B80 • 7B85 • 7B87 • 7B81P • 7B90P |
| MC1408 | 156-0509-00 | Monolithic integrated circuit | 8-bit multiplying DAC | DF1 • 7B81P |
| Motorola 6800 | 156-0426-00 | Monolithic integrated circuit | 8-bit microprocessor | 021-0374-00 • 067-0902-00 • 067-1137-99 • 222 • 2424L • 2445 • 2465 • 4051 • 7912 • 7A16P • 7B81P • 7B90P • CG5001 • CG551AP • CG5010 • CG5011 • DF1 • DF2 • DM5010 • MI5010 • SI5010 • PS5004 • PS5010 |
| Motorola 6820 | 156-0427-00 | Monolithic integrated circuit | "Peripheral Interface Adapter (PIA)" | 7A16P • 7B81P • 7B90P |